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in terror bombings. instructions for making them appear on the internet including just last month in an al qaeda magazine "inspire." investigators say the explosive in boston was most likely smokeless powder, gunpowder like this, available at sporting goods store, not something more powerful like dynamite. and they believe the bombs were carried to the scene in dark nylon bags and set off by timers. the fbi is examining photos like this from nbc affiliate whdh to see if nylon bags might have been placed on trash bags on the sidewalk to appear less conspicuous. a former bomb investigator says the experts know what to look for. >> they are able to recognize the minute pieces of an recall that a civilian wouldn't even know what it was, but a bomb investigator like fbi or atf will say, that's from a clock. that's from a battery. >> reporter: boston police say the area was checked twice for bombs yesterday, but there was no security screening. >> because there is unrestricted access to the race course, simply because it's 28 miles long, people can come and go and bring items in and out. >> repo
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